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A Novel Approach to High Speed Digital Pulse-formers Based on Ring Oscillators for PWM and Class-D Applications

In this paper, a new concept for a high speed, high resolution digital pulse-former is presented. A digital pulse-former basically maps each input data word (sample) into a binary pulse of corresponding width. Such binary pulse-length modulated signals are incorporated in digital class-D amplifiers and pwm applications. In our approach a synchronous digital counter converting the "rough" part of the input sample is combined with a ring oscillator serving as "fine" counter. This hybrid configuration yields a drastically increased resolution while maintaining moderate clock rates. Results of a first discrete implementation of this concept are discussed.

Authors: Streitenberger, Martin; Bresch, Helmut; Kaszubiak, Jens; Schindler, Thomas
Affiliations: Institute of Electromagnetic Theory and Microwave Technique, University of Hannover, Hannover, Germany ; Institute for Electronics, Signal Processing and Communications, Otto von Guericke University Magdeburg, Magdeburg, Germany (See document for exact affiliation information.)
AES Convention:112 (April 2002) Paper Number:5632 Import into BibTeX
Subject:Signal Processing Forum

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E-Library Location: (CD aes19)   /pp2002/pp0205/000106.pdf

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